* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  overflow: hidden;
}
section {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-self: center;
  align-items: center;
  background: linear-gradient(to bottom, #e74c3c, #2980b9);
  &::before {
    content: "";
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 50%;
    z-index: 1;
    backdrop-filter: blur(5px);
    border-top: 1px solid rgba(255, 255, 255, 0.5);
  }
  ul {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    z-index: 2;
    li {
      list-style: none;
      margin: 10px;
      a {
        position: relative;
        text-decoration: none;
        display: inline-block;
        width: 80px;
        height: 80px;
        border: 1px solid rgba(255, 255, 255, 0.4);
        border-radius: 10px;
        border-right: 1px solid rgba(255, 255, 255, 0.2);
        border-bottom: 1px solid rgba(255, 255, 255, 0.2);

        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 2em;
        color: #fff;
        font-family: 楷体;

        box-shadow: 0 5px 45px rgba(0, 0, 0, 0.1);
        backdrop-filter: blur(2px);
        transition: 0.5s;
        overflow: hidden;
        &:hover {
          transform: translateY(-20px);
        }
        &::before {
          content: "";
          position: absolute;
          top: 0;
          left: 0;
          width: 50%;
          height: 100%;
          background: rgba(255, 255, 255, 0.5);
          transform: skew(45deg) translateX(120px);
          transition: 0.5s;
          overflow: hidden;
        }
        &:hover::before {
          transform: skew(45deg) translateX(-80px);
        }
      }
    }
  }
  .color {
    position: absolute;
    filter: blur(150px);
  }
  .color:nth-child(1) {
    width: 400px;
    height: 400px;
    background-color: #e67e22;
    top: 0;
    left: 0;
  }
  .color:nth-child(2) {
    width: 600px;
    height: 200px;
    bottom: 0;
    right: 0;
    background-color: #3498db;
  }
  .color:nth-child(3) {
    width: 300px;
    height: 100px;
    bottom: 100px;
    right: 300px;
    background-color: #f1c40f;
  }
}
